EP2680721B1 - Brosse à dent avec dispositif indiquant la pression de brossage - Google Patents

Brosse à dent avec dispositif indiquant la pression de brossage Download PDF

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Publication number
EP2680721B1
EP2680721B1 EP11708157.0A EP11708157A EP2680721B1 EP 2680721 B1 EP2680721 B1 EP 2680721B1 EP 11708157 A EP11708157 A EP 11708157A EP 2680721 B1 EP2680721 B1 EP 2680721B1
Authority
EP
European Patent Office
Prior art keywords
toothbrush
piezochromic
brushing
head
bristles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11708157.0A
Other languages
German (de)
English (en)
Other versions
EP2680721A1 (fr
Inventor
Madhusudan Patel
Thomas E. Mintel
Sharon Kennedy
John J. Gatzemeyer
Eduardo J. Jimenez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Colgate Palmolive Co
Original Assignee
Colgate Palmolive Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Colgate Palmolive Co filed Critical Colgate Palmolive Co
Publication of EP2680721A1 publication Critical patent/EP2680721A1/fr
Application granted granted Critical
Publication of EP2680721B1 publication Critical patent/EP2680721B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B15/00—Other brushes; Brushes with additional arrangements
    • A46B15/0002—Arrangements for enhancing monitoring or controlling the brushing process
    • A46B15/0038—Arrangements for enhancing monitoring or controlling the brushing process with signalling means
    • A46B15/0044—Arrangements for enhancing monitoring or controlling the brushing process with signalling means with light signalling means
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B9/00—Arrangements of the bristles in the brush body
    • A46B9/06—Arrangement of mixed bristles or tufts of bristles, e.g. wire, fibre, rubber
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B15/00—Other brushes; Brushes with additional arrangements
    • A46B15/0002—Arrangements for enhancing monitoring or controlling the brushing process
    • A46B15/0004—Arrangements for enhancing monitoring or controlling the brushing process with a controlling means
    • A46B15/0012—Arrangements for enhancing monitoring or controlling the brushing process with a controlling means with a pressure controlling device
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B15/00—Other brushes; Brushes with additional arrangements
    • A46B15/0002—Arrangements for enhancing monitoring or controlling the brushing process
    • A46B15/0038—Arrangements for enhancing monitoring or controlling the brushing process with signalling means
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B9/00—Arrangements of the bristles in the brush body
    • A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
    • A46B9/04—Arranged like in or for toothbrushes
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/10—For human or animal care
    • A46B2200/1066—Toothbrush for cleaning the teeth or dentures
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B3/00—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier
    • A46B3/20—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier the bristles being fixed or joined in rubber bodies, e.g. in soft rubber
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/002—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions
    • A46B5/0025—Brushes with elastically deformable heads that change shape during use
    • A46B5/0029—Head made of soft plastics, rubber or rubber inserts in plastics matrix
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/002—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions
    • A46B5/0054—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions designed to allow relative positioning of the head to body
    • A46B5/0062—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions designed to allow relative positioning of the head to body being flexible or resilient during use

Definitions

  • the present invention relates to a toothbrush, and in particular to a toothbrush which incorporates a device to indicate to the user that a suitable force is being applied during brushing.
  • the device disclosed in DE 3724476 avoids the problem of powering the indicator circuit by relying instead on a piezoelectric component to act as a mechanical-electrical converter producing an electrical signal in response to the applied force.
  • these designs require a number of miniature components fitted into a small cavity in the brush handle, which is likely to render them difficult and therefore expensive to manufacture.
  • it is not ideal to locate a battery in a persistently damp environment, especially if it has to be replaced from time to time.
  • US 6389636 discloses a toothbrush comprising a piezochromic material, which signals suitable brushing force without the provision of a power supply or electrical circuitry. See also US 6330730 .
  • Weder (Nature, vol 459, no 7243, pp 45-46 ) describes polymers which react to stress.
  • US patent no. 5,320,784 describes a compound suited for use as a piezochromic material.
  • German patent application publication no. 10 2009 035363 describes a piezochrome material substantially comprising a matrix of a polymer or copolymer, wherein a liquid crystal and a chiral optical active substance are provided in a distributed manner.
  • the piezochromic polymer is contained in a cavity within the toothbrush, and at least a portion of the toothbrush overlying the cavity is transparent or translucent such that the piezochromic polymer is visible.
  • the portion of the toothbrush overlying the cavity is a window located on a back side of the toothbrush, such that the piezochromic polymer is visible when teeth of a user are being brushed in front of a mirror.
  • the piezochromic polymer is an electrocyclic ring-opening mechanophore.
  • the electrocyclic ring-opening mechanophore comprises spiropyran.
  • the spiropyran molecule can be incorporated in a poly(methyl acrylate) polymer or a poly(methyl methacrylate) polymer.
  • the optical signal is at least one color change indicative of at least one of excessive brushing force, acceptable brushing force and inadequate brushing force.
  • the toothbrush is free of a power supply and electrical circuitry.
  • At least some of the bristles comprise the piezochromic polymer.
  • a toothbrush comprising a proximity dye based polymer effective to emit an optical signal indicative of brushing force.
  • the toothbrush further comprises:
  • At least one of the handle, the head, the bristles and the neck comprises the proximity dye based polymer.
  • the proximity dye based polymer is contained in a cavity within the toothbrush, and at least a portion of the toothbrush overlying the cavity is transparent or translucent such that the proximity dye based polymer is visible.
  • the portion of the toothbrush overlying the cavity is a window located on a back side of the toothbrush, such that the proximity dye based polymer is visible when teeth of a user are being brushed in front of a mirror.
  • the optical signal is at least one color change indicative of at least one of excessive brushing force, acceptable brushing force and inadequate brushing force.
  • the toothbrush is free of a power supply and electrical circuitry.
  • the invention comprises a toothbrush incorporating an indicator comprising a pressure (or force) indicating material which provides a signal without the provision of a power supply, such as a battery, and without the provision of electrical circuitry, characterized in that the indicator is capable of providing the signal when a predetermined brushing pressure (or force) is being or has been applied.
  • the user can be provided with a visible signal that a suitable brushing force is being or has been used, and/or a visible signal that an excessive brushing force is being or has been used.
  • a suitable brushing force is preferably less than 3.5 N or less than 3 N or 0.5-2.9 N or 1-2.75 N or 1.5-2.5 N.
  • the brush can be designed to generate a visible signal when brushing force is at least 0.5 N, and/or generate a visible warning signal when brushing force is 3 N or greater.
  • the signal is provided when a suitable brushing force is being applied and is absent when brushing force is too high.
  • the pressure signal is a visible signal, which indicates to the user when a suitable brushing pressure and/or an unsuitable brushing pressure is being applied, but then may relax to its original state, e.g., its original color and/or intensity, after a period of time. This may or may not be after the user has finished a normal brushing regime.
  • the relaxation time of the material providing the optical response may typically be in the region of 1 second to 24 hours, though it is preferably long enough for the user to register it, and is preferably less than 24 hours. More preferably, the relaxation time for the pressure indicating material is from 1 second to 10 minutes or 1-10 seconds or 2-5 seconds.
  • a pressure indicating material is a material adapted to show an optical response upon the application of pressure.
  • Pressure indicating materials as defined herein include piezochromic materials, which as defined herein, refer to materials that show a color change in response to pressure (or force) being applied thereto.
  • a pressure indicating material is a material that shows an optical response to a stimulus other than pressure, wherein the stimulus is provided to the material by another element of the toothbrush as a function of brushing force.
  • Piezochromic materials include but are not limited to piezochromic polymers, such as for example, crystals of toluene sulphonate diacetylene polymers; or copolymers containing poly(diacetylenes) or poly(silylenes).
  • the pressure indicating material may be one susceptible to relative changes in refractive index upon the application of pressure, for example aromatic solvents containing poly(N-methyl acrylamide).
  • the pressure indicating material in the toothbrush of the invention is a piezochromic material of the electrocylic ring-opening mechanophore type.
  • Potisek et al., "Mechanophore-Linked Addition Polymers.” J. Am. Chem. Soc., 2007, 129 (45), pp 13808-13809 discloses suitable methods for preparing certain electrocylic ring-opening mechanophores of the present invention.
  • Preferred mechanophores include spiropyran.
  • Preferred polymers to which the mechanophore is linked include poly(methyl acrylate) and poly(methyl methacrylate).
  • the indicator is capable of providing a signal when brushing pressure is being or has been applied and is absent when brushing pressure is too high.
  • the pressure indicating material is so calibrated to be capable of providing such a signal.
  • An example of such calibration for a brush comprising a piezochromic material may be the presence of only a certain amount of the active shear sensitive material or the inclusion of an additional material, such as a polymer, which may act as a signal modifier, e.g., by changing the viscosity of the piezochromic material, which will prevent a signal being provided if the brushing pressure is too high.
  • the signal provided on application of brushing pressure may be graduated to reflect changes in brushing pressure within the suitable range and above the suitable range.
  • the signal may be green when brushing pressure is optimal; amber when pressure is sub-optimal but acceptable and red when pressure is approaching an unacceptable level.
  • the signal would, of course, disappear when the correct pressure is no longer being applied.
  • the intensity of the optical signal may vary with the intensity of the brushing pressure.
  • the pressure indicating material is activated not by the process of brushing but by the user's grip.
  • a strong grip may be suggestive of an aggressive brushing style which may damage the gums.
  • the indicating material may be incorporated so as to provide a signal when the user's grip is within a range which corresponds to a correct brushing pressure.
  • Indicator materials preferred for use in the invention display an optical response (a color change) within the range of pressure generated by brushing, which is not affected by the range of temperature to which a brush is normally subjected.
  • a further property desired of a preferred indicator material is that this material can relax to its original state reasonably quickly.
  • An indicator substance which requires a period of days to recover would not be suitable for the present application. It has, however, been found useful to use a material for providing the optical response which demonstrates a degree of hysteresis.
  • the relaxation period of the indicator material may be such that it can be seen when the correct brushing pressure is being or has been exceeded during brushing, i.e., the signal disappears as soon as the correct pressure is no longer being applied.
  • the relaxation period may be so short that changes in brushing technique are quickly represented by the indicator material and several changes in brushing technique may be made.
  • a separate mechanism is used to trigger the indicator, for example a predetermined flexure of the brush or movement of the bristles causes two components to move relative to each other and to close an electrical circuit.
  • the need for such a mechanism is avoided, as the force exerted on the brush is communicated directly to the indicator.
  • the optical indicator e.g., piezochromic
  • the optical indicator can be heat-sealed into a vinyl envelope, or it can be otherwise encapsulated.
  • Two plates of the pressure indicating material may be used, which plates are squashed together by an applied force.
  • plates of the material are interleaved with the brush bristles. Pressure applied to the bristles causes bending of the bristles as well as the plates.
  • the material is formed into a resilient membrane located at the base of the bristles, with the brush head preferably being transparent to allow the pressure indicating material to be visually inspected.
  • a mechanical arrangement is provided to transmit the force to the indicator.
  • the brush may have two handle sections linked by a pivot, a portion of one of these sections extending beyond the pivot into a cavity provided in the other section. Excessive pressure causes the two sections to rotate relative to each other, in opposite directions about the pivot, such that one face of the extended portion will be brought into contact with the inner surface of the cavity in which it is located. That interior surface is provided with a pad of the pressure indicating material. Designs such as this, which employ moving elements to transmit the applied force to the indicator, have the advantage that the force may be amplified or reduced to fall within the response range of the pressure indicating material.
  • the brush body may be made of materials and with methods used in the art, for example using injection molding techniques and materials such as polypropylene and polymethyl methacrylate.
  • the bristles may be made of materials which are used in the art, including nylon and polybutylterephthalate.
  • FIG. 1 shows a toothbrush 10 having a head 20 integrally formed with a handle 30 via a neck 60.
  • the head 20 is provided with bristles 40 made of nylon.
  • the head 20 and handle 30 are made of a resilient transparent material such as polymethyl methacrylate and define a cavity 50 extending substantially along the entire length of the brush 10.
  • the cavity 50 is filled with a piezochromic material.
  • a predetermined pressure (suitable for brushing teeth) applied to the bristles 40, or a predetermined flexure of the handle 30, will be transmitted to, and thereby cause an optical response (such as a change of color) of, the piezochromic material.
  • the cavity 50 may, instead of extending substantially the entire length of the brush 10, be more localized, for example, it may be confined to a neck region 60 joining the handle 30 to the head 20.
  • FIGS. 2 and 3 show respectively a side and plan view of the head 120 of a second embodiment of the invention to a larger scale.
  • Bristles 140 are interleaved with plates 170 made of piezochromic material. Force applied to the brush head 120 in the direction of arrow F causes flexure of the bristles 140 and the plates 170 in the way shown, and this deformation is transmitted to the plates 170 which will cause an optical response such as a change in color in the piezochromic material as a function of brushing pressure.
  • FIG. 4 shows a side view of a third embodiment of the invention, and shows a brush head 220 provided with bristles 240.
  • the base of each bristle 240 is attached to a flexible membrane 280, which contains the piezochromic material. Force applied to the bristles 240 in the direction of arrow D is transmitted to the membrane 280, and causes it to deform. Deformation of the membrane 280 stresses the piezochromic material contained within it, causing an optical response in the material such as a change of color on the application of suitable force.
  • FIG. 5 shows a modified version of the brush head of FIG. 4 , in which piezochromic material is contained in a sac 290. Force applied to the bristles 240 is transmitted to the sac 290 via flexible membrane 280 causing it to deform, thereby causing an optical response in the piezochromic material.
  • the membrane 280 does not contain piezochromic material. Indeed, in a further modification, the membrane is not required, in which case force applied to the bristles 240 is transmitted directly to the sac 290.
  • FIG. 6 shows a side view of a fourth embodiment of the invention, in which a handle 330 and a neck 360 of the brush 310 are pivotally connected at 400.
  • a portion 410 (indicated in dotted lines) of the neck 360 extends beyond the pivot 400 into a cavity 350 formed in the handle 330.
  • the neck 360 is integral with the head 320 of the brush 310.
  • At least the handle 330 is formed of a transparent plastics material such as polymethyl methacrylate. Force applied to the bristles 340 of the brush 310 in the direction of arrow G, whilst the handle 330 is being held firmly, causes the handle and the head 320 to rotate relative to each other about the pivot 400 in the directions of the arrows H1 and H2.
  • Rotation is impeded as the neck portion 410 comes into contact with a pad 420 containing a piezochromic material. Continued mechanical applied to the head 320 of the brush 310 is transmitted to the pad 420 causing an optical response in the piezochromic material.
  • FIG. 7 shows a cross-sectional view of a fifth embodiment of the invention, in which brush 710 contains lever 700, which pivots about fulcrum 780 when force J is applied against bristles 740, such that force J is transmitted from bristles 740 to piezochromic material 790, which is located in the neck of the brush.
  • the optical response of piezochromic material 790 is visible through window 770.
  • piezochromic material 790 and window 770 to be placed on the back side of the brush with lever mechanism rearranged, e.g., to a second class type lever wherein fulcrum 780 is located further down the neck or handle than piezochromic material 790.
  • FIG. 8 shows a cross-sectional view of a sixth embodiment of the invention, in which brush 810 contains bladder 880, which hydraulically transmits force K, which is applied against bristles 840, to piezochromic material 890 located in the neck of the brush.
  • the optical response of piezochromic material 890 is visible through window 870.
  • FIG. 8 shows the window in the front side of brush 810, it is also within the scope of the invention for piezochromic material 890 and window 870 to be placed on the back side of the brush.
  • polarized materials are used as pressure indicating material, with pieces of polarized material being configured such that their planes of polarization are at 90° to each other.
  • One of the pieces of material is fixed, and the other is able to move on the application of excessive pressure (for example by being attached to a mechanical type embodiment as described in conjunction with FIGS. 6 and 7 above) such that a different orientation of polarization planes is achieved, and thereby a color change is observed.
  • sheet form polarizers which are orientated parallel to each other, and which are separated by an arrangement such as a coiled spring and/or a helical arrangement, whereby the two polarizers are caused to rotate relative to each other when they are brought closer to or further apart from each other in response to changes in brushing pressure.
  • the polarizers adopt a different configuration relative to each other, and a color change is observed.
  • the pressure indicating material is a polymer that signals brushing force by re-orientation of initial dye-dye interactions within neighboring polymer fibers.
  • Such pressure-sensitive polymers can be created by taking advantage of the property of certain dye molecules that change color based on their proximity to other dye molecules.
  • These "proximity dye based polymers” can be used, e.g., in embodiments analogous to those of FIG. 6 , wherein the relative rotation of handle 330 and head 320 about pivot 400 will cause the dye molecules inside the polymer to approach each other, and in embodiments analogous to that of FIGS. 2-3 , wherein brushing force causes proximity dye based polymers of the bristles to approach each other.
  • the enhanced proximity causes the emission properties of the dye molecule to change either via charge transfer interaction or excimer formation. This appears as an optically different color. Repeated high pressure brushing may prevent reversibility and lock in color and could also be used as an indicator for the lifetime of a toothbrush.
  • ranges are used as shorthand for describing each and every value that is within the range. Any value within the range can be selected as the terminus of the range.

Claims (8)

  1. Brosse à dents (10) comprenant :
    (a) un manche (30) ;
    (b) une tête (20) ;
    (c) des soies (40) positionnées sur la tête (20) ;
    (d) un collet (60) joignant le manche (30) à la tête (20) ; et
    un polymère piézochromique efficace pour émettre un signal optique indicateur d'une force de brossage, dans laquelle le polymère piézochromique comprend un mécanophore électrocyclique à ouverture de chaîne cyclique ;
    dans laquelle au moins un(e) parmi le manche (30), la tête (20), les soies (40) et le collet (60) comprend le polymère piézochromique ; et
    caractérisée en ce qu'au moins une surface au contact des soies de la tête (20) comprend le polymère piézochromique, et les soies (40) sont transparentes ou translucides de telle sorte qu'une couleur de la surface au contact des soies de la tête (20) est visible.
  2. Brosse à dents selon une quelconque revendication précédente, dans laquelle le polymère piézochromique est contenu dans une cavité (50) à l'intérieur de la brosse à dents, et au moins une partie de la brosse à dents recouvrant la cavité (50) est transparente ou translucide de telle sorte que le polymère piézochromique est visible.
  3. Brosse à dents selon la revendication 2, dans laquelle la partie de la brosse à dents recouvrant la cavité (50) est une fenêtre située sur un côté arrière de la brosse à dents, de telle sorte que le polymère piézochromique est visible lorsque les dents d'un utilisateur sont brossées devant un miroir.
  4. Brosse à dents selon une quelconque revendication précédente, dans laquelle le polymère piézochromique comprend un spiropyrane.
  5. Brosse à dents selon la revendication 4, dans laquelle le polymère piézochromique comprend un poly(acrylate de méthyle) ou un poly(méthacrylate de méthyle).
  6. Brosse à dents selon une quelconque revendication précédente, dans laquelle le signal optique est au moins un changement de couleur indicateur d'au moins une parmi une force de brossage excessive, une force de brossage acceptable et une force de brossage inadéquate.
  7. Brosse à dents selon une quelconque revendication précédente, dans laquelle la brosse à dents est dépourvue d'une alimentation en énergie et d'un ensemble de circuits électriques.
  8. Brosse à dents selon l'une quelconque des revendications 2 à 7, dans laquelle au moins certaines des soies (40) comprennent le polymère piézochromique.
EP11708157.0A 2011-03-01 2011-03-01 Brosse à dent avec dispositif indiquant la pression de brossage Active EP2680721B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2011/026643 WO2012118487A1 (fr) 2011-03-01 2011-03-01 Brosse à dents comprenant un dispositif pour indiquer la force de brossage

Publications (2)

Publication Number Publication Date
EP2680721A1 EP2680721A1 (fr) 2014-01-08
EP2680721B1 true EP2680721B1 (fr) 2017-11-01

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ID=44625370

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11708157.0A Active EP2680721B1 (fr) 2011-03-01 2011-03-01 Brosse à dent avec dispositif indiquant la pression de brossage

Country Status (10)

Country Link
US (1) US9578957B2 (fr)
EP (1) EP2680721B1 (fr)
KR (1) KR101562721B1 (fr)
CN (1) CN103415230B (fr)
AU (1) AU2011360962B2 (fr)
CA (1) CA2828375C (fr)
MX (1) MX348280B (fr)
RU (1) RU2560275C2 (fr)
TW (1) TW201247141A (fr)
WO (1) WO2012118487A1 (fr)

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Publication number Publication date
CN103415230A (zh) 2013-11-27
KR20130143114A (ko) 2013-12-30
US9578957B2 (en) 2017-02-28
EP2680721A1 (fr) 2014-01-08
RU2560275C2 (ru) 2015-08-20
CA2828375C (fr) 2016-08-30
KR101562721B1 (ko) 2015-10-22
US20130340188A1 (en) 2013-12-26
CA2828375A1 (fr) 2012-09-07
TW201247141A (en) 2012-12-01
CN103415230B (zh) 2016-01-20
AU2011360962B2 (en) 2015-04-09
MX2013009907A (es) 2013-11-04
MX348280B (es) 2017-06-02
RU2013143966A (ru) 2015-05-20
AU2011360962A1 (en) 2013-05-09
WO2012118487A1 (fr) 2012-09-07

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